Need a password to enter the game. Such as where, I make a game, it shows a lock on it somewhere, and if you click it, it says, "A password is needed to enter this game." and has a box below that says in it, "Enter Password Here" and it vanishes when you click the box. If the incorrect password is used it will say, "Sorry, That is not the correct password, you have one more try." And if they get it wrong again, it puts them in the starting screen, as if they were kicked from the game.
(Analogy) Example: I make a game (Vortex_Master's game) and I made it private, but told a few people in the lobby that the password was "vortex" and it had a Lv. 20 Minamum on it. Say a level lower than 20 tries to join, the regular happens, but if say, a Lv. 29 clicks it and gets the password wrong twice it acts as if he wasn't a high enough level, and kicks him, and if he clicks it again, it says, "You input the incorrect password, try again later."
This would allow for "private" games to ACTUALLY be private, with a minamal amount of kicking required.
Here is an example of a game with this "private" game feature: http://armorgames.com/play/12546/the-last-castle
Thank you.